| 摘要 |
When refrigerant shortage has occurred, a failsafe operation, for example, for stopping an ice-making operation is carried out to thereby suppress wasteful electric power consumption and prevent an ice-making section and a compressor from being damaged. An ice-making machine alternately and repeatedly carries out the ice-making operation for producing ice blocks (M) by cooling an ice-making section (10) on which is disposed an evaporator (14) connected to a refrigeration system (12), by supplying refrigerant to the evaporator (14) for circulation, and deicing the operation for causing the ice blocks (M) produced on the ice-making section (10) to be released therefrom. During the ice-making operation, when time in which the outlet temperature of refrigerant from the evaporator (14) takes to reach a first preset temperature K1, after the start of the ice-making operation, is longer than a normal time tn1 in which the outlet temperature of the refrigerant from the evaporator (14) takes to reach the preset temperature K1 the abnormal state of shortage of refrigerant is determined and a failsafe operation is carried out.
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